"I can't think of you romantically because you look too much like a child."

Arisu is an office worker whose baby face and short height of 145cm has caused her to have zero romantic experience in all 22 years of her life. Though this hasn't changed even after she became a working adult, Kazami, her direct supervisor and trainer, is the only one who treats her gently even when making physical contact.

At first, she thought that Kazami was also just treating her like a child but... as she comes to learn of his precise working manner, his frank disposition and the odd facial expressions that he shows sometimes, Arisu's heart begins to waver...